Supplement to: Riesgo, Ana; Pérez-Portela, Rocío; Pita, Lucía; Blasco, Gema; Erwin, Patrick S; López-Legentil, Susanna (2016): Population structure and connectivity in the Mediterranean sponge Ircinia fasciculata are affected by mass mortalities and hybridization. Heredity, https://doi.org/10.1038/hdy.2016.41